Blow mold having slots to allow air to escape

Details Blow mold having slots to allow air to escape Blow mold having slots to allow air to escape

1997-12-03

1999-08-10

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

425812, B29C 3310, B29C 4962

Patent

active

059356200

ABSTRACT:
The present invention concerns a molding device with a longitudinal axis, comprising a first half-shell and a second half-shell, the two half-shells being capable of being joined along an opening plane so as to form a cavity with an elongate cross-section, having a major axis and a minor axis. The opening plane of the mold is substantially perpendicular to the major axis. In accordance with the invention, each half-shell comprises at least two separate longitudinal parts joined along at least one joint surface, each joint surface being delimited by two opposed sides of two adjacent parts, at least one of the sides having at least one recess so as to define with the other side at least one narrow slot to allow air to escape along the surface during the blow molding of the object.

REFERENCES:
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patent: 3354509 (1967-11-01), Ammondson
patent: 4120635 (1978-10-01), Langecker
patent: 4151976 (1979-05-01), Schurman
patent: 4909972 (1990-03-01), Britz
patent: 5217729 (1993-06-01), Terauchi et al.
patent: 5411699 (1995-05-01), Collette et al.
Plastverarbeiter, vol. 35, No. 7, Jul., 1984, pp. 102-103, Bericht Von Der Tagung Der VDI-K in Bamberg, "Entwicklungsschwerpunkt Blaswerkzeug".
Otto Plajer, "Werkzeuge Fur Das Blasformen", 1968, Zechner & Huthig Verlag GmbH, pp. 161-165.
Blow Molding Handbook, D. V. Rosato, 1989, Hanser Publishers, pp. 282-289.

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